---

This could be Botanophila fugax.....but again to be sure I have to see the genitals !

I just give you some advice to prepare the genitals:

Cut the abdomen in half and put it in a mixture of one spoon hot water and some drops of detergent to soften the genitals.
Wait for several hours and put the abdomen in vinigar for a minute.
With a fine pair of tweezers you can seperate the 5th sternite and surstylus apart (don’t botter about the appendage that could stick on to the genitals, they can be removed later on in KOH)

Then try to make photos of them.

If you don’t have KOH you can use the white grain in drain cleaner (two or three grains are enough) and take a very small glass that can be heat up, put a teaspoon water + the grains + the genitals into it and boil it all for about a minute or less. (don't inhale!)

Take out the genitals and wash them in some water or alcohol and than put the genitals in a very small glass object filled with a bottom of glycerine……than you are ready for take of.:)

Johanna